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Gossypium arboreum

life science Maturity 5-7 Next article →

Gossypium arboreum is a species of plant known as tree cotton. This shrub is native to the regions of India and Sri Lanka. It is highly valued because it produces fibers used for textiles. Humans have used this plant for thousands of years to make cloth. Evidence shows it was cultivated during the Indus Valley Civilisation. These ancient people grew it near the Indus River. They used the plant to create various cotton textiles.

The physical structure of tree cotton is quite distinct. It grows as a shrub reaching heights of one to two meters. The branches are a purple color and are covered in fine hairs. The leaves are attached to the stem by a petiole, which is a small stalk. These petioles measure between 1.5 and 10 cm in length. The leaf blades are shaped like an oval or a circle. They feature five to seven lobes. This gives the leaves a look similar to a maple leaf. The lobes are linear or lanceolate in shape. Sometimes, a small tooth is present in the sinus, which is the space between lobes.

Detailed botanical features help scientists identify this specific species. The leaves are glabrescent, meaning they lose their hairiness as they get older. However, young leaves possess hair that is both simple and stellate, or star-shaped. At the base of the leaves, you can find stipules. These are small structures that are linear or lanceolate in shape. They can also be falcate, which means they are shaped like a sickle. Glands are also found along the midrib or on the adjacent nerves of the leaf.

The reproductive parts of the plant are also very specific. The flowers grow on short stalks called pedicels. Each flower has an epicalyx, which is a series of bracts that look like sepals. These segments are dentate, meaning they have teeth along the edges. They are cordate, or heart-shaped, at the base and acute at the tip. The true calyx is much smaller and has a cupular, or cup-like, shape. It features five subtle dentations. The corolla, or the petals, is usually pale yellow. Some flowers have a purple center, while others are entirely purple. The staminal tube, which holds the anthers, is 1.5 to 2 cm long.

History plays a major role in how we understand tree cotton today. The Swedish scientist Carl Linnaeus included this plant in his work, Species Plantarum. He published this important book in 1753. Linnaeus also supplied the holotype for the species. A holotype is a single physical specimen used to formally describe a species. This original sample is currently held in the Linnean Herbarium. This herbarium is located within the Swedish Museum of Natural History.

The fruit of the plant is a capsule that contains the cotton fibers. This capsule is ovoid or oblong in its overall shape. It is composed of three or four cells. The surface of the capsule is glabrous, meaning it is hairless, and it appears pitted. There is also a beak located at the terminal end of the fruit. Inside the capsule are globular seeds. Each seed is covered in long, white cotton fibers. These fibers are the primary reason the plant is so important to humans.

There are specific varieties of tree cotton that have unique properties. One notable type is known as phuti karpas. This variant was grown in a specific area south of Dhaka. It grew along the banks of the Meghna River in Bengal, which is now Bangladesh. This specific type of cotton was used to produce Dhaka muslin. This fabric was very special because of the strength of its threads. The phuti karpas could be spun into threads with higher tensile strength than any other cotton variant. This allowed for the creation of extremely fine and strong textiles.

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